EP3573252A1 - Stratégie de précodage pour multidiffusion de données - Google Patents

Stratégie de précodage pour multidiffusion de données Download PDF

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Publication number
EP3573252A1
EP3573252A1 EP18305635.7A EP18305635A EP3573252A1 EP 3573252 A1 EP3573252 A1 EP 3573252A1 EP 18305635 A EP18305635 A EP 18305635A EP 3573252 A1 EP3573252 A1 EP 3573252A1
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EP
European Patent Office
Prior art keywords
coder
optimized
computing
resource units
matrix
Prior art date
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Withdrawn
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EP18305635.7A
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German (de)
English (en)
Inventor
Nicolas Gresset
Victor EXPOSITO
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Mitsubishi Electric Corp
Mitsubishi Electric R&D Centre Europe BV Netherlands
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Mitsubishi Electric Corp
Mitsubishi Electric R&D Centre Europe BV Netherlands
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Application filed by Mitsubishi Electric Corp, Mitsubishi Electric R&D Centre Europe BV Netherlands filed Critical Mitsubishi Electric Corp
Priority to EP18305635.7A priority Critical patent/EP3573252A1/fr
Priority to US17/040,773 priority patent/US11258488B2/en
Priority to PCT/JP2019/019598 priority patent/WO2019225485A1/fr
Priority to CN201980033521.8A priority patent/CN112136280B/zh
Priority to JP2020545189A priority patent/JP7012864B2/ja
Publication of EP3573252A1 publication Critical patent/EP3573252A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to the broadcasting or more generally to the multicasting of data in a wireless communication system employing a Multiple Input Multiple Output (MIMO) scheme.
  • MIMO Multiple Input Multiple Output
  • SNR signal-to-noise ratio
  • the broadcast service that is, the Evolved Multimedia Broadcast Multicast Service (eMBMS) is dynamic.
  • the emitter also called the base station, receives the channel quality observed by each user, enabling the base station to adapt the transmission of the data intended for the receivers in its cell according to the instantaneous deployment of these receivers. Therefore, the base station can dynamically switch from broadcast (or multicast) to unicast: when broadcasting some data turns out to be less efficient than sending the same data on resources allocated individually to each receiver (user equipment also called terminals in the following) then the base station switch to a unicast transmission mode.
  • broadcast or multicast
  • unicast when broadcasting some data turns out to be less efficient than sending the same data on resources allocated individually to each receiver (user equipment also called terminals in the following) then the base station switch to a unicast transmission mode.
  • the invention aims at improving the situation.
  • the invention relates to a method for transmitting by a transmitter, comprising N Tx antennas, a public data to at least a number K of terminals in a wireless communication system employing a MIMO (Multiple Input Multiple Output) scheme, using a set of N pre-coder (W i ), said method comprising:
  • the invention enables to transmit parts of a public data via the transmitter using different pre-coders, that is, using different pre-coding matrix. Therefore, each part of the public data is broadcasted (or multicasted) to the K terminals using a different pre-coding matrix, enabling to adapt to the instantaneous deployment of the K terminals.
  • pre-coders otherwise called the pre-coding matrix
  • the quantity of data sent using each of the pre-coder can be optimized according to the channel quality returned by the terminals to reduce the radio resources needed to transmit the public data to the K terminals.
  • the public data is divided according to the N' optimized resource units quantities (T'(i)) and each part of the public data (D i ) is transmitted according to one of the optimized pre-coders (W' i ).
  • the optimized resource units quantities T'(i) are computed based on the optimized pre-coders W' i to enhance the broadcast/multicast transmission capacity regarding the K terminals.
  • the method enables to enhance the spectral efficiency and power consumption for broadcast or multicast transmission.
  • the method proceeds to two optimizations, the first one being the optimization of the pre-coders W i into optimized pre-coders W' i , the second one being the optimization of the distribution of the resource units used to transmit data with each optimized pre-coders W' i . Therefore, the resource units computed depend on the pre-coders W' i determined. This greatly enhances the broadcast/multicast transmission capacity.
  • the transmitter is part of a wireless communication system employing MIMO schemes. Therefore, the transmitter uses multiple transmit antennas (N Tx antennas) and the receivers, that is, the terminals may use several receive antennas.
  • the transmission through the N Tx antennas is defined via the configuration of a pre-coding module, that is, by implementing specific pre-coders or pre-coding matrix.
  • the resource unit corresponds to the unit used by the transmitter to allocate the radio resources for downlink transmission.
  • the resource units are time-frequency resources called resource blocks.
  • quantity of resource unit it is understood a number of resource unit.
  • the quantity of optimized resource units T'(i) is therefore a number of resource units used to transmit the data D i (being part of the public data) using the optimized pre-coder W' i .
  • the sum of resource units quantities is chosen to be equal to the number of resource units T pubdata needed to transmit the public data.
  • the size of the resource units T pubdata depends notably on the modulation and coding scheme (MCS) used to transmit the public data. This can easily be obtain by multiplying each resource units quantity by T pubdata / ⁇ T' ( i ) .
  • MCS modulation and coding scheme
  • the resource units used to transmit one part of public data D i can be distributed in time, in frequency or in both at the same time.
  • the resource units quantities and the pre-coders are optimized.
  • the optimization is done according to the K terminals, that is, to the terminals to which the public data is intended to be sent. More specifically, the optimization is done according to the channel qualities of the channels linking the transmitter with each of the K terminals.
  • This channel quality can be represented by a matrix H(k) (1 ⁇ k ⁇ K) of complex coefficients, each complex coefficient representing the instantaneous signal-to-noise-ratio of a radio channel between one of the transmitter's antenna and one of the k-th receiver's antenna.
  • the instantaneous signal-to-noise ratio can vary quickly according to the small-scale fading of the radio propagation channel.
  • the small-scale fading variation is mainly due to the moving scatterers and to the Doppler Effect when the terminal is moving.
  • the average of said instantaneous signal-to-noise ratio is a long-term signal-to-noise that only varies according to the large-scale fading, i.e., when a terminal position changes more than several wavelength of the transmission signal.
  • the matrix H(k) represents the channel quality of the channel linking the k-th terminal with the transmitter.
  • the transmitter can obtain the channel quality of each terminal based on feedbacks given by each terminal, for example in the form of a pre-coder codebook index.
  • this pre-coder codebook index is the Pre-coding Matrix Indicator (PMI).
  • PMI Pre-coding Matrix Indicator
  • Other method to determine the channel quality can be applied for example the transmitter can analyze the channel quality of the uplink channel linking the k-th terminal with the transmitter.
  • the optimization of the resource units quantities and the optimization of the set of pre-coders is done to obtain a higher overall transmission capacity (overall channel capacity), that is, the sum of the transmission capacity (or channel capacity) experienced by each terminal.
  • the optimized resource units quantities and the optimized pre-coders are generally not the combination of resource units quantities and pre-coders which ensure the best transmission capacity, but at least they enable to enhance the broadcast/multicast transmission capacity between the transmitter and the K terminals.
  • the optimizations carried out by the invention that is, the optimization of resource units quantities and the optimization of pre-coders, enhance the broadcast/multicast transmission capacity experienced by the K terminals.
  • the N' optimized resource units quantities T'(i) and the sets optimized pre-coders that satisfy the above inequation enhance the worst channel capacity experienced by one of the K terminals. Since the transmission of the public data is done in a broadcast (or multicast) manner, enhancing the worst channel capacity is equivalent to enhancing the capacity of the transmission.
  • the sum of resource units quantities is chosen to be equal to the number of resource units needed to transmit the public data.
  • the transmitter may need to determine the channel quality experienced by each terminal, which may be defined for the k-th terminal by the matrix H(k). Therefore, the transmitter may receive information enabling it to determine H(k) or an approximation of it for each terminal. For example, the terminal can receive index indicating a pre-coder from a codebook (PMI - Pre-coding Matrix Indicator in LTE).
  • a codebook PMI - Pre-coding Matrix Indicator in LTE
  • each of the K terminals is the recipient of the public data.
  • the determining of the set of optimized pre-coder comprises obtaining a merged pre-coder MW i 1 , i 2 which is obtained by merging the pre-coders W i 1 and W i 2 .
  • MW i 1 , i 2 , W i 1 and W i 2 are matrix representing pre-coders.
  • the number of rows in the matrix representing the pre-coders is equal to N Tx .
  • the pre-coding matrix used in the following will be matrix with a unique row. That is, only the case with terminals with one receiving antenna is described. The person skilled in the art could easily adapt the implementation of the invention to the case where the terminals have more than one receiving antenna.
  • the determining of the set of N' optimized pre-coder (W' i ), comprises:
  • Argmax of a function stands for the arguments of the maxima of this function.
  • computing N-1 optimized resource units quantities comprises:
  • a Moore-Penrose pseudo inverse matrix ( B # ) of the matrix B is defined for example in https://en.wikipedia.org/wiki/Moore-Penrose_inverse.
  • B # ( B H B ) -1 B H
  • B # B H ( BB H ) -1 .
  • B H is the conjugate transpose of a matrix B.
  • the computation of the N-1 optimized resource units quantities is in the context of the invention a computation of low complexity and therefore enables to reduce the needed computing resources.
  • the determining of the set of N' optimized pre-coder (W' i ), comprises:
  • the N-1 optimized resource units quantities computed on the basis of the selected set will then redistribute all the resource units, including the freed resource units, in an optimized way, respectively to the N-1 pre-coders of the selected set.
  • the determining of the set of optimized pre-coder (W' i ) comprises:
  • this equation has N unknowns it has one more degree of freedom than the formulas obtained with a set of N-1 pre-coders. Therefore, this formula can potentially have more local maximums and a bigger overall maximum. This is all the more true as the number N of pre-coders originally used by the transmitter is small or the number of iterations of method is important.
  • the conjugate transpose of a matrix X is obtained from X by taking the transpose and then taking the complex conjugate of each entry.
  • the N' optimized resource units quantities T' ( i ) corresponding to the N' optimized pre-coder (W' i ) are obtained by
  • This computation in the context of the invention is of low complexity and therefore enables to reduce the computing needed.
  • These N resource units quantities obtained enable to enhance the efficiency of the optimization of the pre-coders performed in step /a/.
  • the computing performed in /a/ is repeated in a loop, the N' optimized pre-coder (W' i ) replacing the N pre-coder (W i ) when the computing performed in /a/ is repeated.
  • a second aspect of the invention concerns a computer program product comprising code instructions to perform the method as described previously when said instructions are run by a processor.
  • a third aspect of the invention concerns a transmitter for transmitting a data to at least a number K of terminals in a wireless communication system employing a MIMO (Multiple Input Multiple Output) scheme, the transmitter comprises:
  • a transmitter 1.1 transmitting a radio signal to several receivers 1.2.
  • the receivers 1.2 are in the cell of the transmitter 1.1.
  • This transmission may be an OFDM based transmission for example in the context of LTE-based system.
  • the receivers 1.2 are mobile terminals, also called terminals, and the transmitter 1.1 is a fixed station which in the context of LTE is a base station.
  • public data is intended to be sent to several terminals, that is, at least two terminals 1.2 are in the cell of the transmitter.
  • the transmitter 1.1 comprises one communication module (COM_trans) 1.3, one processing module (PROC_trans) 1.4 and a memory unit (MEMO_trans) 1.5.
  • the MEMO_trans 1.5 comprises a non-volatile unit which retrieves the computer program and optimization algorithms and a volatile unit which may store the optimized pre-coders and the optimized resource units quantities.
  • the PROC_trans 1.4 may be configured to determine the matrix H(k), determine the N' optimized pre-coder (W' i ), compute N' optimized resource units quantities T'(i), configures the COM_trans 1.3, configure the pre-coder module 2.0, divide the public data into N' data D i , transfer the parts of the public data D i to the COM_trans 1.3.
  • the COM_trans 1.3 is configured to transmit to the receivers 1.2 the N' data D i , each of the N' data being a part of the public data.
  • the COM_trans 1.3 may include the pre-coder module 2.0.
  • the processing module 1.4 and the memory unit 1.5 may comprise the processor and the non-transitory computer-readable medium of the transmitter.
  • the processing module 1.4 and the memory unit 1.5 can be dedicated to the computing of the optimized resource units quantities and to the determining of the optimized pre-coder (/a/ and /b/) or also used for other functions of the transmitter like for processing the radio signal transmitting the public data. For example, by configuring the pre-coder module 2.0 of the transmitter 1.1 according to the set of optimized pre-coders, allocating the resource accordingly, dividing the public data according to the optimized resource units quantities and adapting the modulation scheme according to the channel quality.
  • FIG 2 there is shown a specific scheduling of resource units and a pre-coder module 2.0 which converts several symbols at the input of the pre-coder module 2.0 into several symbols on each antenna ports.
  • a quantity T'(1) of resource units are used to transmit a part D 1 of the public data.
  • the resource units are resource blocks.
  • the symbols of the T'(1) resource blocks are pre-coded onto N Tx antenna ports with the pre-coder module 2.0 configured with the pre-coder W' 1 .
  • the pre-coder module 2.0 is configured with the pre-coder W' 2 .
  • the pre-coder module 2.0 pre-codes the symbols of the following slot, containing the T'(2) resource blocks used to transmit another part D 2 of the public data, onto N Tx antenna ports. The process is repeated until the symbols of the last group of T'(N') resource blocks are pre-coded onto the N Tx antenna ports with the pre-coder module 2.0 configured with the pre-coder W' N' . Therefore, the pre-coding module 2.0 pre-codes the symbols of each group of resource blocks (the T'(i) resource blocks) with a different configuration, that is a different pre-coder. Thus, the scheduling of the resource blocks needs to be done according to this scheme to be synchronized with the changes of the configurations of the pre-coding module 2.0.
  • the configuration of the pre-coder module 2.0 can be done by the PROC_trans 1.4.
  • the quantity T'(i) of resource blocks which are used to transmit the public data part D i may be superior than the maximum number of resource blocks in one slot, then the T'(i) resource blocks are distributed into two or more slots, the configuration of the pre-coder module 2.0 is then done accordingly, that is, when the pre-coder module 2.0 pre-codes the symbols related to these slots the pre-coder modules 2.0 is in the same configuration W' i
  • the scheduling and the configuration of the pre-coder module 2.0 are implemented in a time manner. That is, the pre-coder module 2.0 is configured the same way for all the resource blocks of a same slot. Conversely, the resource blocks from two different groups of resource blocks (for example, the group of T'(m) resource blocks used to transmit the D m part of the public data and the group of T'(n) resource blocks used to transmit the D n part of the public data) are not scheduled in the same slot.
  • the way the public data is divided into the (D i ) with i from 1 to N' depends on the set of optimized resource units quantities T'(i) and on the modulation and coding schemes (MCS) which are used to code the data in each group of resource blocks.
  • MCS modulation and coding schemes
  • the MCS index chosen may be high, to enable to have a high transmission rate. That is, the modulation scheme will be less robust and the coding rate will be bigger, thus the high channel quality will enable to have a high transmission rate, expressing the fact that the channel capacity is good.
  • the data D i may be encoded on T'(i) resource units using an MCS index sufficiently small to enable the terminal among the K terminals with the poorest channel transmission regarding the pre-coder W' i to receive the data. That is, setting the MCS index for the T'(i) resource units according to min k f ( ⁇ W' i * H ( k ) ⁇ 2 ) . Therefore, the total amount of resource units ⁇ T' ( j ) is set up according to the size of the public data and to the MCS index respectively chosen for each group of T'(i) resource units.
  • the total amount of data that can be transmitted using the N' groups of T'(i) resource units can be expressed by ⁇ j T' ( j ) , with ⁇ j dependent on the MCS index used for the T'(j) resource units and ⁇ j T' ( j ) represents the total amount of data (payload data) that the T'(j) resource units can transmit using the pre-coder W' j .
  • the public data is then divided according to the ⁇ j T' ( j ).
  • the public data is divided in N' parts of data according to the maximum payload data that each group of resource blocks can transmit. If the sum of the maximum payload data each group of resource blocks can transmit is below the size of the public data, the quantities T'(i) can be divided by ⁇ T' ( j ) and multiplied by a value ⁇ sufficiently big.
  • the invention can be implemented with antennas ports implementing another scheme than an Orthogonal frequency-division multiplexing (OFDM) scheme.
  • OFDM Orthogonal frequency-division multiplexing
  • FIG. 3 there is shown another specific scheduling of resource units and a pre-coder module 2.0 which converts several symbols at the input of the pre-coder module 2.0 into several symbols on each antenna ports.
  • the pre-coder module 2.0 is configured by the PROC_trans 1.4 and the resource blocks are scheduled as detailed hereafter.
  • the resource blocks used to transmit the N' data parts D i of the public data are processed at the same time, that is, in the case of a LTE-based system in the same slot.
  • the pre-coder module 2.0 is configured jointly with different pre-coders or different pre-coder matrix, depending on the input bandwidth. The pre-coder module 2.0 process the resource blocks according to the part of the bandwidth in which they are.
  • each bandwidth BW i is equal or bigger to the size required to carry, in the same slot, the T'(i) resource blocks which are used to transmit D i .
  • the T'(i) resource blocks are carried by subcarriers with frequencies included in the BW i . Therefore, the T'(i) resource blocks that are transmitted through the BW i are processed with the pre-coder W' i .
  • the outputs of the pre-coding of the symbols of each group of T'(i) resource blocks are multiplexed together on each antenna port. That is, the symbols on one of the antenna ports are identical, regarding the subcarriers in the BW i , to the result of the pre-coding of the part of the symbols containing the T'(i) resource blocks onto the same antenna port.
  • the pre-coding module 2.0 pre-codes the symbols of each group of resource blocks with a single configuration.
  • the scheduling of the resource blocks needs to be done according to the described scheme, that is, the T'(i) resource blocks must be scheduled in the BW i .
  • the configuration of the pre-coder module 2.0 can be done by the PROC_trans 1.4.
  • the quantity T'(i) of resource blocks may be superior to the maximum number of resource blocks in the BW i in one slot, in this case the T'(i) resource blocks are distributed into two or more slots in the same BW i .
  • the scheduling and the configuration of the pre-coder module 2.0 are implemented in a frequency manner. That is, the configuration of the pre-coder module 2.0 and the scheduling of each T'(i) resource blocks are done according to the partition of the global bandwidth in sub-bandwidths (BW i ).
  • the way the public data is divided into the (D i ), with i from 1 to N', is identical as in the implementation of figure 2 , that is, the partition of the public data depends on the set of optimized resource units quantities T'(i) and to the modulation and coding schemes (MCS) which are used to code the data in each group of resource blocks (in practice only one MCS is chosen for the encoding on all the resource units used for the transmission of the public data).
  • MCS modulation and coding schemes
  • the quantities T'(i) can be divided by ⁇ T' ( j ) and multiplied by a value ⁇ sufficiently big, if the sum of the maximum payload data each group of resource blocks can transmit is below the size of the public data.
  • figure 2 which is a time manner implementation and the implementation of figure 3 , which is a frequency manner implementation, can be combined. That is, the configuration of the pre-coder module 2.0 can change through time and the configurations used to process the resource blocks in one slot can use all or at least several optimized pre-coding matrix among the set of optimized pre-coding matrix.
  • the transmitter is parametrized, that is, a set of N pre-coder (W i ) and the optimization algorithms are stored in the transmitter's 1.1 memory, for example the MEMO_trans 1.5.
  • the initial set of pre-coders is for example generated from a Discrete Fourier Transform (DFT) matrix.
  • DFT Discrete Fourier Transform
  • the initial set of pre-coders can be obtained by:
  • W k can be set as the matched filter H k H ⁇ H k ⁇ .
  • the PROC_trans 1.4 may determine the matrix H(k). Indeed, as previously mention the transmitter may need to determine the channel quality experienced by each of the K terminals. These channel qualities may be defined for each k-th terminal by the matrix H(k). For this purpose the transmitter may receive information enabling it to determine the H(k) matrix, for example the transmitter can receive from each of the K transmitters an index indicating a pre-coder from a codebook, which is the PMI in LTE systems. Like previously mentioned, other methods can be used to determine the channel quality, for example the transmitter can analyze the channel quality of the uplink channel with the k-th terminal.
  • the (W' i ) respectively corresponding to the T'(i).
  • the computing of the N' optimized resource units quantities T'(i) and the determining of the set of N' optimized pre-coders (W' i ), are done based on the N pre-coder (Wi).
  • determining of the set of N' optimized pre-coders (W' i ) and the computing of the N' optimized resource units quantities T'(i) may be performed by:
  • the merged pre-coder MW p,q is obtained by merging the pre-coders W p and W q .
  • the step S12 may be repeated in a loop, with the N-1 optimized pre-coder (W' i ) replacing the N pre-coder (W i ) when step S12 is repeated.
  • the PROC_trans 1.4 configures the COM_trans 1.3 according to the set of optimized pre-coders determined (W' i ) and to the optimized resource units quantities T'(i). For example, the PROC_trans 1.4 may configure the pre-coder module 2.0.
  • the PROC trans 1.4 divides the public data into N' data D i . This partitioning of the public data is done according to the set of optimized resource units quantities T'(i) and to the modulation and coding schemes (MCS) which are used to code the data in each group of resource blocks (in practice only one MCS is chosen for the encoding on all the resource units used for the transmission of the public data).
  • MCS modulation and coding schemes
  • each T'(i) can be divided by ⁇ T' ( j ) and multiplied by a value ⁇ sufficiently big.
  • the PROC_trans 1.4 transfers the parts of the public data D i to the COM_trans 1.3.
  • the transmitter is parametrized, that is, a set of N pre-coder (W i ) and the optimization algorithms are stored in the transmitter's 1.1 memory, for example the MEMO_trans 1.5.
  • the PROC_trans 1.4 may determine the matrix H(k). Indeed, as previously mentioned, the transmitter may need to determine the channel quality experienced by each of the K terminals. These channel qualities may be defined for each k-th terminal by the matrix H(k). For this purpose the transmitter may receive information enabling it to determine the H(k) matrix, for example the transmitter can receive from each of the K transmitters an index indicating a pre-coder from a codebook, which is the PMI in LTE systems. Like previously mentioned, other method can be used to determine the channel quality, for example the transmitter can analyze the channel quality of the uplink channel with the k-th terminal.
  • This computing may be performed by:
  • the determining of the set of N' optimized pre-coder (W' i ), are done based on the N resource units quantities and the N pre-coder (W i ).
  • the determining of the set of N' optimized pre-coder (W' i ) may be performed by:
  • the merged pre-coder MW m,m' is obtained by merging the pre-coders W m and W m' .
  • the determining of the set of N' optimized pre-coder (W' i ) may be performed by:
  • the computing of the N' optimized resource units quantities T'(i) is done based on the N' pre-coder (W' i ).
  • steps S23 and S24 may be repeated in a loop, with the optimized pre-coders (W' i ) replacing the pre-coders (W i ) and the T'(i) replacing the T(i) when step S23 is repeated.
  • the PROC_trans 1.4 configures the COM_trans 1.3 according to the set of optimized pre-coders determined (W' i ) and to the optimized resource units quantities T'(i). For example, the PROC_trans 1.4 may configure the pre-coder module 2.0.
  • the PROC_trans 1.4 divides the public data into N' data D i . This partitioning of the public data is done according to the set of optimized resource units quantities T'(i) and to the modulation and coding schemes (MCS) which are used to code the data in each group of resource blocks (in practice only one MCS is chosen for the encoding on all the resource units used for the transmission of the public data).
  • MCS modulation and coding schemes
  • each T'(i) can be divided by ⁇ T' ( j ) and multiplied by a value ⁇ sufficiently big.
  • the PROC_trans 1.4 transfers the parts of the public data D i to the COM_trans 1.3.
  • the invention when repeating the step S13 the invention can be implemented by replacing the step S13 by S23 and S24, therefore alternating the embodiment of figure 4 and of figure 5 . Conversely, when repeating the steps S23 and S24 the invention can be implemented by replacing the steps S23 and S24 by the step S13.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
EP18305635.7A 2018-05-24 2018-05-24 Stratégie de précodage pour multidiffusion de données Withdrawn EP3573252A1 (fr)

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Application Number Priority Date Filing Date Title
EP18305635.7A EP3573252A1 (fr) 2018-05-24 2018-05-24 Stratégie de précodage pour multidiffusion de données
US17/040,773 US11258488B2 (en) 2018-05-24 2019-05-10 Method for transmitting, computer program product, and transmitter
PCT/JP2019/019598 WO2019225485A1 (fr) 2018-05-24 2019-05-10 Procédé de transmission, produit-programme d'ordinateur et émetteur
CN201980033521.8A CN112136280B (zh) 2018-05-24 2019-05-10 发送方法、计算机可读存储介质和发送机
JP2020545189A JP7012864B2 (ja) 2018-05-24 2019-05-10 送信方法、コンピュータプログラム製品、及び送信機

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017069510A1 (fr) * 2015-10-19 2017-04-27 Samsung Electronics Co., Ltd. Procédé d'émission de signal, procédé de réception de signal, émetteur et récepteur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8964866B2 (en) 2010-07-02 2015-02-24 Lg Electronics Inc. Method and apparatus for transmitting signals using codebooks in a wireless communication system that supports multiple antennas
EP3155745A4 (fr) * 2014-06-16 2018-01-10 Nec Corporation Procédé et système de communication mu-mimo
CN107852207B (zh) * 2015-07-09 2019-04-26 三菱电机株式会社 发送装置、接收装置、控制站、通信系统和发送预编码方法
CN107026681B (zh) * 2016-02-01 2022-01-14 北京三星通信技术研究有限公司 信号发送方法、接收方法、发射机和接收机
CN107733494B (zh) * 2016-08-12 2021-06-29 大唐移动通信设备有限公司 一种预编码方法、信道状态信息确定方法及装置
US10784939B2 (en) * 2016-09-29 2020-09-22 Lg Electronics Inc. Method and apparatus for calculating CQI in a wireless communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017069510A1 (fr) * 2015-10-19 2017-04-27 Samsung Electronics Co., Ltd. Procédé d'émission de signal, procédé de réception de signal, émetteur et récepteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KARIPIDIS E ET AL: "Quality of Service and Max-Min Fair Transmit Beamforming to Multiple Cochannel Multicast Groups", IEEE TRANSACTIONS ON SIGNAL PROCESSING, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 56, no. 3, 1 March 2008 (2008-03-01), pages 1268 - 1279, XP011203490, ISSN: 1053-587X *

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CN112136280B (zh) 2022-08-12
US20210006311A1 (en) 2021-01-07
WO2019225485A1 (fr) 2019-11-28

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